Intelligent lighting control

For Bexleyheath library, energy saving was their first objective, a lighting solution was secondary. The installation was done at night time to allow
ongoing service to customers. The system gives power to local users, for example they can change light levels themselves for book launches, school
holiday events, etc.

We’ve already had some great customer feedback. Savings opportunities include reduction in energy use, reduction in maintenance costs and fewer call
outs.

Our intelligent lighting system – Sylsmart – is self-learning and predictive: it puts lights on when and where you need them and provides the right amount of light, in the right place, for the
right amount of time.

Sensors are built into fittings in the factory. The sensors in each light fitting all talk to each other: no additional hardware or wiring are
required, and there’s no compatibility issues. Just plug in and the luminaires will auto-configure: no commissioning required. The sensors create their own Bluetooth 5 mesh which is self-healing (recreates mesh if 1 unit replaced): it fails ‘on’ if the sensor fails.

You can specify minimum light levels – eg in unoccupied corridors @ 30% - controlled through an app. You can also have a wireless and battery-free
wall-switch which can override controls, eg for presentations.

The system adjusts light output over time to ensure surface lighting remains as required. The system also feeds into BMS and heat maps (eg can alter
cleaning pattern if rooms not used). This can also be also useful for security and catering requirements because you know roughly know how many
people onsite. You can use the data to generate better value.

We replaced T8s with LED in around 450 fittings on 2 floors (including non-public areas), alongside the smart lighting controls. The costs and
savings were:

Lighting costs were c £27.5k/year

Proposed costs £3k/year to run - £24.5k/year saving

£80k install cost = payback of 10 years (just energy) or 3 years with all costs (including maintenance).
We can finance this – eg spread over 10 years

Expecting actual savings to be even better than this, based on 3 months monitoring (sub-metering on lighting
circuits)

Reduction in cooling not included in calculations

Energy Management in London Boroughs

The London Boroughs Energy Group exists to share knowledge and support joint working on energy related issues between public sector bodies in and around
London.

We are a forum for Energy Managers from the London Boroughs and other public sector organisations in London and the surrounding counties. Membership of LBEG provides excellent opportunities to share knowledge and best practice, network with colleagues and associates and keep up to date with activity to promote energy
efficiency across London.